const download0 = (data: Blob, fileName: string, mineType: string) => {
  // 创建 blob
  const blob = new Blob([data], { type: mineType });
  // 创建 href 超链接，点击进行下载
  window.URL = window.URL || window.webkitURL;
  const href = URL.createObjectURL(blob);
  const downA = document.createElement("a");
  downA.href = href;
  downA.download = fileName;
  downA.click();
  // 销毁超连接
  window.URL.revokeObjectURL(href);
};

const download = {
  // 下载 Excel 方法
  excel: (data: Blob, fileName: string) => {
    download0(data, fileName, "application/vnd.ms-excel");
  },
  // 下载 Word 方法
  word: (data: Blob, fileName: string) => {
    download0(data, fileName, "application/msword");
  },
  // 下载 Zip 方法
  zip: (data: Blob, fileName: string) => {
    download0(data, fileName, "application/zip");
  },
  // 下载 Html 方法
  html: (data: Blob, fileName: string) => {
    download0(data, fileName, "text/html");
  },
  // 下载 Markdown 方法
  markdown: (data: Blob, fileName: string) => {
    download0(data, fileName, "text/markdown");
  },
  // 下载图片（允许跨域）
  image: ({
    url,
    canvasWidth,
    canvasHeight,
    drawWithImageSize = true
  }: {
    url: string;
    canvasWidth?: number; // 指定画布宽度
    canvasHeight?: number; // 指定画布高度
    drawWithImageSize?: boolean; // 将图片绘制在画布上时带上图片的宽高值, 默认是要带上的
  }) => {
    const image = new Image();
    // image.setAttribute('crossOrigin', 'anonymous')
    image.src = url;
    image.onload = () => {
      const canvas = document.createElement("canvas");
      canvas.width = canvasWidth || image.width;
      canvas.height = canvasHeight || image.height;
      const ctx = canvas.getContext("2d") as CanvasRenderingContext2D;
      ctx?.clearRect(0, 0, canvas.width, canvas.height);
      if (drawWithImageSize) {
        ctx.drawImage(image, 0, 0, image.width, image.height);
      } else {
        ctx.drawImage(image, 0, 0);
      }
      const url = canvas.toDataURL("image/png");
      const a = document.createElement("a");
      a.href = url;
      a.download = "image.png";
      a.click();
    };
  }
};

export default download;
